Thank you so much for the mention!! What a useful concept - I hope they have a number of subscribers to keep the service running. There are so many good valid reasons to have something like this (and of course bunches of unpleasant reasons).

There's also Trashmail, just create a free account at their site, (any emails sent to the Trashmail address are forwarded for a short period - there are limits with free accounts), and then use their Firefox plugin:

Good luck. Without any other info besides a username and password, it's going to be hard. There are really only a handful of free email sites left, and they all (AFAIK) require to know who you really are, to varying degrees. Unless you have a friend who runs a private email server, I'm not optimistic about your chances.